Mold for concrete pipes



Nov.20,l923.

T. SCHUSTER MOLD FOR CONCRETE PIPES original Filed Jan. 27. 1921 s sheets-sheet 1 y vwawtofc ffzmkf C'lbowu m a Nov. 20 1923.

T. SCHUSTER MOLD FOR CONCRETE PIPES y 2 TM ma m .c s 5 1 f Upiginalv Filed Jan.

Nov. 20 1923.

T. SCHUSTER MOLD FOR CONCRETE PIPEs Original Filed Jan- 2'7. 1921 3 Sheets-Sheet 5 awuentoz @VH1/woo Patented Nov. 20, 1923.

UNM-ED STATES PATENT orties.

MOLD FOR CONCRETE PIPES.

Application filed January 27, 1921, Serial No. 440,441. Renewed June 8, 1923.

T o all whom t may conce/m.'

Be it known thatv I, THOMAS SoHUsTnR, al

citizen of the United States, residing at Phoenix, in t-he county of Maricopa and State of Arizona, have invented certain new and useful improvements `in Molds for Concrete Pipes; and I do dec-lare the following to be a full, clear, and e-Xact description of be just as quickly and easily disassembled for removal of the hardened casting, t-he time saved by the employment of such a mold insuring an increased output of pipelengths.

Another object of the invention is to provide a mold of the above mentioned type made up of an outer casing and an inner core member, each ot' which are eXpansible and are retained in proper spaced relation by rings arranged, one at the bottom and one at the top between the lcasing and the core, the inne-r faces of these rings being especially shaped to give a corresponding shape to the ends of the pipelengths so that when the complete lengths are -joined in forming a pipe-line, tight connection between these various lengths is insured.

A further object ofthe invention is to provide a mold embodying the aforesaid outer casing and core member, the bottom of the latter being in the form of a novel expander which is such that it will retain theV core in a true concentric shape and prevent it from becoming crushed by the sur rounding concrete.

A still furtherobject of the invention is to provide amold embodying the aforesaid novel expansible bottom for the core together with a specialwedge for expanding the segments of which the bottom is composed and a special tool for removing the wedge. Y f

Still another object of the invention is to provide a mold embodying a hopper atk its upper end and a removable cover forA the core with eo'aetlng ineens between the' cover and hopper for preventing accidental displacement of the cover.

Another object and feature of the invention is to provide a mold wherein the core is made from a sheet of metal rolled into tubular form with its ends overlapping each other, this member being reinforced by an internal rib and being provided with internal brackets to permit the` use'of a special tool for contracting the core Vto permit easy and ready removal of the latter from theV casting.

These and other objects and advantages of the invention will become'apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a vertical sectional view of a mold constructed in accordance with this invention.

Figure 2 is a sectionaly view of the upper portion of the mold showing a hopper and other adjacent parts removed andthe upper spacing ring in place.

Figure 3 is a. similar view of the lower portion of the mold taken at substantiallyY right angles to Fig. 1, the special core contracting tool being shown in position for use. f

Figures 4 and 5 are horizontal sections taken on the pla-nes of the lines 4-4 and 5-5 respectively of Fig. 3.

Figure 6 is a detail perspective view of a portion of the shaping ring which surrounds the exterior upper end of the core member.

Figure 7 is a detail view of one of the retaining rings which are placed inside the core member at the top of the latter;`

`Figure 8 is a detail perspective view showing the manner in which the overlapped ends of the outer casing are connected.

Figures 9, 10and 11 are perspective views of a wedge, wedge remover and core contracting tool which I employ in connection with my mold.

Figure 12 is a top plan view. with portions broken away. of a slightly modified form 'of hopper embodying a shaping ring.

Figurev 13 is a central sectional view taken therethrough on the plane of the line 13-13 ofV Fig. 12.

Figure 14 is a sectional view of the upper portion of the mold showing thefsame equipped. with.. hangs .forming ring-f Figure 15 is a central vert-ical section through a vslightly modifiedk form of'core embodying a different type of expander means.

Referring to the drawings, wherein the preferred embodiment of the invention is clearly illustrated, it will kbe seen that the improved mold comprises an outer cylindrical sheet metal casing 1 having its ends overlapped and secured together as disclosed in Fig. S. By reference to this ligure,-itwill be seen that the casing is formed on one of its edges with a plurality of slots 2 which receive screw-threaded studs 3 carried by the other end of the sheet, binding nuts t, preferably wing-nuts, serving to bind the overlapped ends of the sheet together in the manner disclosed. This is one way in'which the ends of the casing may be secured together but I do not desire to be limited to this particular construction since any other suitable meansmay be well employed for the purpose. Arranged in the casing and spaced therefrom to provide the necessaryspace for pouring the liquid concrete, is a core member 5 which is likewise formed from a sheet of material rolled and having its ends overlapped. For the purpose of providing the proper space between the casing and core for forming a pipe-length of a predetermined thickness, also for assisting in retaining the parts 1 and 5 in true concentric shape, I make use of upper and lower spacing rings 6 and 7 respectively. it this point, I wish to direct attention to the fact that the inner faces of these rings are especially shaped to give corresponding shapes to the ends of the pipe-lengths so that when the completed lengths are aligned to form a pipe-line, tight connection between the various lengths will be insured. I have shown the rings as formed with'a particular bead. However, they may be shaped otherwise if desired or'necessary. Also, I wish to have it understood that the upper ring 7 is not placed in position until after the filling operation has been completed and the hopper and adjacent parts removed.

As before intimated, I make use-of a novel expander for the core which also serves the additional function of forming the bottom of said core; Vfhile this expander may be of some other construction, I prefer to construct it as better shown in Figs. 4 and 5. By reference to these figures, it will be seen that the expander is made up of ay pair of spaced substantially triangular blocks 8 which have their inner adjacent edges bevelled as indicated at 9 for a purpose to be hereinafter described. Abutting the outer edges of the blocks 8 and spaced from one another, are a plurality of segments 10 having straight inner edges for engagement with the blocks 8 and curved outer edges for contact with the inner' wall of the core 5. The blocks and segments are moved inwardly to decrease the diameter of the expander automatically by the contraction of the core. On the other' hand, they are expanded by the employment of a T0 wedge 11 which is positioned between the blocks 8 to coact with the bevelled edges 9. At this peint, I may mention that the blocks and 'segments may, if desired, be composed of wood to reduce the cost of manufacture as much as possible. To prevent relative displacement of the various members of the expander and to serve` as a protector therefor, I employ a pair of circular plates 12 and 13 respectively, the first named plate be- 80 ing lpositioned on top of the blocks and segments and the remaining plate being disposed beneath these parts as shown in Figs.

1 and ,3. In order to connect the plates together and in turn retain the parts of the expander in their proper relative positions, the lower plate 13 is provided,4 with upwardly extending studs 111 which pass through notches 15 formed in the segments 10 and in turn through apertures formed in the upper plate 12, nuts 1G being connected to the free projecting ends of the bolts 14. With this construction and arrangement, it will be seen that the desired relative movement of the parts of the expander may be obtained, and yet the parts may be easily and readily separated for replacement of the parts if found necessary. It is, of course, understood that the upper plate 12 is formed with a central slot for passage of the wedge. It may be well to state that the wedge in its preferred form includes a lateral headed extension 17 which construction permits use of a special wedge removing tool 18 as shown in Fig. 10. This tool in accordance with my ideas includes a shank 19 having at one end a handle 20 and at its opposite end a head x.of the wedge, it is only necessary to permit said head to pass between the spaced lingers, after which the tool will be slightlyrotated so that the lateral ends of the fingers will become engaged with the head. When the tool isthus connected to the wedge, the latter may be easily and readily removed which issometimes not the case with the ordinary construction. I deem it advisable to mention at this point, that although I have shown and described particular kind of wedge and wedge removing tool, I do not wish to be limited to the particular construction of the members shown, since any other suitable construction may well serve the same purpose.

By referring now to the upper end of the mold, it will be seen that I preferably close the upper open end of the core 5 by means of a c ver this cover being allowed tc remain in position until after the concrte is poured between the casing and the core. It is to be noted that the cover includes a comparatively wide cylindrical rim 24: which sdesigned to extend down into the core to assist in retaining this end of the latter in true concentric shape.- By preference, the lower end of the rim 24 is directed `This retaining ring 26 is preferablyA constructed as shown in Fig. 7, that is, itis provided with a reinforcing strip 27 which decidedly increases the strength of the ring. To also assist in properlyshaping this end ofthe core and to prevent possible expansion of the latter, I make use of a shaping ring 28 which surrounds the exterior of the core at the upper end of the latter. In its preferred form, this ring 28 is constructed as better shown in Fig. 6 wherein it is disclosed that it is split and theends directed laterally as shown alt 29, one of these laterally directed ends carrying a suitable latch 30 for connecting the ends together when the ring is in operative position. IVith this construction, it will be seen that when the latch is removed to ineffective position, the resiliency of the ring` will cause the ends to automatically separate, thus permittingr easy and ready removal of the ring from the core. n

To assist in the filling operation, I make use of a flared'V hopper 31 which includes ay cylindrical neck 32`adapted to extend down into the outer casing l as shown in Fig. 1. I have already. intimated that I provide coacting means between the hopper and the aforesaid cover to prevent possible displacement 4of the latter.

cover is provided with a central upstanding projection 33 and that the hopper carries a pivoted bowed arm 34- which is centrally apertured to permit passage of the ,aforesaid projection 33 therethrough."

' It sometimes happens that difficulty is experienced in contracting the core and to overcome this, I make use of a special tool 35 for accomplishing this end. The tool is better shown in Fig. 11 and by reference to this figure, it will be seen that it comprises a handle equipped with a pair of pivoted hooks 36, the laterally bent free ends of which are adapted to be inserted in apertures in the brackets 37 arranged on the interior of the core slightly above the lower end of the latter. In Fig. 3 I have shown the tool in position for use and it is obvious that by grasping the handle and giving it a turn in To this end and byY` reference to Fig. 1', it will be seen that the the direction of the arrow, the contraction of the core will be easily accomplished. If desired, there may' also be arranged on the 'interior of the core, a reinforcing rib 38 which will be preferably disposed adjacent'v one of theends ofthe core and will be, ydisposed in a vertical position.

In Figs. 12 and 13 there is shown a slightly modified form of the invention whereinV an examination will disclose that the hopper 315* has associated with it, a shaping ring 28a, the two parts being secured together by` suitable connectors 29a. By combining lthe -shaping ring with a hopper, the mold may be more easily and readily assembled as is obvious and the rigidity of the shaping ring will be increased.

In some cases, it may be desired to equip the pipe-lengths with lateral connecting Vflanges instead of equipping them with the special beads as formed by the novel spacing rings 6 andy 7 In order to permit this, Iy make use of a quick detachable flange forming ring 39 for connection to the outer casing 1, this construction and arrangement of parts being shown in Fig. 14E.

The construction of expander already described is especially designed to be used in cases where relatively large and long lengths of pipe are being formed. However, the same result may be accomplished in cases where smaller lengths of pipes are desired to be formed, by the construction and arrangement of core disclosed in the modified fornr ,of the invention in Fig. 15. Reference being had to this figure, it will be seen that the core is provided on its inner wall adjacent Vone end and opposite the reinforcing rib 38 with a pair of inclined short angle pieces 4() and when the ends ofthe core are overlapped and the pieces 4() brought close to the reinforcing rib 3,8, substantially V-shaped 4spaces, are provided between these parts, and in vthese spaces,

contemplate inserting wedges 41, whichVrv when driven toward one another, will cause the core to become expanded.

The method of using the mold is as fol? lows: The core 5 is placed within the lower spacing ring 6 and the expander is then placed inside o-f the core in the manner shown. The outer casing 1 is placed around the ring 6 and its ends overlapped and' bound together by means of the wing-nuts 4;. The shaping and retaining ning 28 is then placed around the outside of the core at the topl and the ends hooked together by means of the latch 30. Assuming that the expander has been placed in position at the bottom of the core and that the hopper and cover placed in the position shown in Fig. 1, the liquid concrete is poured between the casing and. core and after this, the hopper and cover are removed and the upper spiacing ring 7 is placed in position as indicated in Fig. .2. If it is desired to expand the After the concrete becomes hardened, the expander and wedge are removed. Then j the contracting tool 35 is b-rought into play for the purpose of contracting the core and withdrawing it from the completed casting. By loosening the nuts 4, the outer casing can be easily removed and the mold set up again for forming another length of pipe.

A careful consideration of the foregoing description taken in connection with the accompanying drawings is thought to be sufficient to enable persons skilled in the art to whichthe invention relates to obtain a clear understanding of the same. Therefore, a more lengthy description is deemed unnecessary. v

Since probably the best results may be obtained Wiiththe construction and arrangement shown and described, this construction and arrangement is taken as apreferred embodiment of the invent-ion. However,`I wish it to be understood that minor changes Within the scope of the invention may be resorted to.

I claim:

l. A mold forconerete pipes comprising` an outer cylindrical casing, an inner expansible and contractible core arranged in and spaced from said casing, means for retaining the casing and core in spaced relation, means for holding the coreI in true concentric shape, and an expansible bottom for the latter including a pair of triangular blocks having bevelled edges disposed in sp-acedrelation, and afplurality of other blocks or segments engaging and arranged about the first named blocks and forming a substantial disk, the aforesaid bevels serving to permit use of a wedge for increasing the diameter of the disk and in turn expanding said core.

2. Aniold for concrete pipes including an expanding device composed of a pair of triangular blocks having beveled edges disposed in spaced relation, and aplurality of n other blocks or segments engaging and arranged about the rst named blocks and forming a disk, the aforesaid bevels serving to permit use of a wedge for increasing the diameter of therdisk so as to enable the core with which it co-aets to be expanded.

3. Thel structure set for in claim l .to-

.gether with a pair'of plates, arranged one yof the yhoppen-said projection extending removably through the aperture in this arm' to assist in preventing displacement of the cover. i Y

5. A mold for pipes comprising a cylindr'- cal outer casing, a cylindrical core arranged therein and spaced therefrom, a hopper telescoping into the upper end of the casing, carrying a shaping ring at its lower end into which the upper end of the core extends; and means inside of the core for forcing it into -tiight engagement with said ring.

6. In combination a wedge provided with a headed lateral extension, and a removing tool including a headed shank provided with spaced lingers to engage the head on said extension for removing said wedge,

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

THOMAS SCHUSTER. 

